Question

find sum 3+7+11+......199​

Answer 1

Answer:

3+7+11+178=199

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Answer 2

Step-by-step explanation:

Sum of 1+3+5+7+.....+199

a=1 d=2

Finding n th term in A.P; a n =a+(n−1)d

=> n=100

Therefore, no. of terms,n=100

sum of 100 terms = n/2(a+an) =100/2(1+99)

=50(200)

=10000.

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