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Find an A.P of seven terms whose sum is 84 and common difference is 3​

Find an A.P of seven terms whose sum is 84 and common difference is 3​
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1 vote
Find an A.P of seven terms whose sum is 84 and common difference is 3​

User JackieWillen
by
7.5k points

1 Answer

4 votes

Answer:

t7= a+6d

s7= n÷2(2a+(n-1)3)

s7= 7÷2 (2a+18)

84=7a+63

7a=21

a=3

A. P=3,6,9,12,15,18,21.

User Balaswamy Vaddeman
by
7.0k points
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