“∑n2 = n(n+1)(2n+1)/6” has been added to your cart. Continue shopping Product Price Quantity Subtotal Brain Sharpners (Hindi) ₹120.00 Brain Sharpners (Hindi) quantity ₹120.00 ∑n2 = n(n+1)(2n+1)/6 ₹420.00 ∑n2 = n(n+1)(2n+1)/6 quantity ₹420.00 Coupon: Cart Totals Subtotal ₹540.00 9% CGST ₹37.80 9% SGST ₹37.80 Total ₹616.00 Continue Shopping Checkout