[shruti290Participant]

i’m not sure but i think the answer is 50c2/100c2+50c2/100c2
how i got here is tht if u observe the pattern then u will notice tht if both m and n are odd or both m and n are even then 7^m+7^n will be divisible by 5 so there are 2 cases
case 1 when both m and n are odd
case 2 whn both are even
and the prbability will be case1 + case 2

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[shruti290Participant]

i think sahi hai because we are getting the right answer

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[shruti290Participant]

If order is imp and repetition is allowed theb total outcomes would bcome 100*100 and fav events 2*1250 and hence the ans becomes 1/4

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[shruti290Participant]

Total outcomes are 100c2

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[shruti290Participant]

I’m so sorry mh questions got interchanged in the reply ! I don’t know how to go abt for tht q2

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[shruti290Participant]

Rhoit I got tht but if u take the pattern tht I have taken in the correction it gets divisible by 5

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[shruti290Participant]

Rohit I got q2 but the 1st one i don’t know how to proceed.

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[shruti290Participant]

after making the correction i get is 98/4950
case 1 {(1,3) (3,5) (5,7) and so on} they make a total of 49 outcomes
case 2 {(2,4) (4,6) and so on} make a total of 49 outcomes

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[shruti290Participant]

sir by doing this i observed tht half the no of outcomes were there wehn no of heads>no of tails
so does the ans becomes 2^42?
nd what if it was 42 toses then we would have observed it for 2 ,4,6 etc no of tooses?

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[shruti290Participant]

but sir why did he take 0?

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[shruti290Participant]

how did u get 2^6

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[shruti290Participant]

But sir what i have done is tht first when i said tht we draw 10 balls frm 30 white and 30 blue balls so this sample will automatically include the case where either only 10 white balls are drwan or10 blue balls are drwan .so this does not becomes the case of exactly one color missing

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[shruti290Participant]

the correct answer is 20

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[shruti290Participant]

my final answer aslo comes out to be the same. can anyone tell me what is my mistake?

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[shruti290Participant]

Why did u take o ?
And tell me one thing it says “the no of numbers” so shouldn’t we take the one digit two digit three and four digit no’s As well and since it says diff even do digits therefore we cannot exceed beyond four digits ?

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