Question

7+14+21+_+140=_
How to solve these

Answer 1

Answer: The sum is 735.

Step-by-step explanation: We need to start by finding the number of terms, n .

The formula  t n   =  a  +  (  n  −  1  )  d  gives the nth term of an arithmetic series.

98  =  7  +  (  n  −  1  )7

98  =  7  +  7 n  −  7

7 n  =  98

n  =  14

We can now apply the formula  s n  =  n upon 2     ( t  1  +  t n  )  to determine the sum of the series.

s 14  =  14  upon 2  (  7  +  98  )

s 14  =  7  (  105  )

s 14  =  735

Hopefully this helps!

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