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2 months, 3 weeks ago

The sum of the first 20 terms common between the series 3+7+11+15+..... and 1+6+11+16+..... , is :

- Option 1)
4000

- Option 2)
4020

- Option 3)
4200

- Option 4)
4220

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Use

Sum of n terms of an AP -

and

Sum of n terms of an AP

- wherein

first term

common difference

number of terms

series are 3,7,11,15,19,23,27,31..............

and 1,6,11,16,21,26,31....................

So common terms are 11,31,............

Option 1)

4000

**Option 2)**

**4020**

Option 3)

4200

Option 4)

4220

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