1.

Find the value of the expression: 1 – 3 + 5 - 7… to 100 terms. (a) −150 (b) −100 (c) −50 (d) 75

Answer»

Correct option (b) −100

Explanation:

View: 1 − 3 + 5 − 7 + 9 − 11 ..... 100 terms as (1 − 3) + (5 − 7) + (9 − 11) ...... 50 terms. 

Hence, −2 + −2 + −2 … 50 terms = 50 × −2 = −100. 



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