Maths / Arithmetic Progression / Find First Term when Common Difference, Number of Terms and Sum of N Terms is given

QUESTION
 

If the first term of an AP is - 3 and the common difference is 2, what is the sum of the first 10 terms of the AP ?

EXPLANATION
Explain TypeExplanation Content
Text

large S_n=frac{n}{2}left [ 2a+(n-1)d right ]n=10;a=-3,d=2;S_n=5left [ a(-3)+9times(2) right ]

large S_n=5left [ -6+18 right ]

large S_n=60

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