Find the number of terms common to the two AP's 3,7,11,15.... 407 and 2, 9 ,16.......709.

Explanation

`AP_1=3,7,11,...,407`

`407=3+(n-1)4`

`404=(n-1)4`

`n-1=101`

`n=102`

`AP_2=2,9,16,...,,709`

`709=2+(m-1)7`

`707=(m-1)7`

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