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A man sold 12 candles at Rs 10 had loss of a%. When he again sold 12 candles for Rs 12 he had a profit of a%. Find the value of a.

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TCS Other Question

Find the average of the terms of the series 1 -2 +3 -4 +5 -6 +7+..... +199 -200. There are 4 boys and 5 girls in two separate queues. Two separate queues are merged so that the position of the boys (in relation to each other) and those of girls (in relation to each other) remain unchanged. In how many ways this can be done?