Question

fine sum of the following series 7+14+21+....to 20 term​

Answer 1

Answer:

a=7 , d = 14-7=7

a20=a+19d

=7+19(7)

=7+133

a20=140

Step-by-step explanation:

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Answer 2

Answer:

answer is 1470

Step-by-step explanation:

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