Question

1,7,13,.... is a arithmetic sequence. find the sum of consecutive 22 term of this sequence?​

Answer 1

answer

22 term = 1+(22-1)6

=1+21+6

=127

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Answer 2

a= 1 , d= 7-1 =6 , n= 22 Sn =?

Sn = n/2{2a+(n-1)d}

= 22/2{2+(22-1)6}

Sn = 11 { 2+66} = 11×68 = 784

Sn = 784